摘要:
A device for capturing a refueling process is described, in which the device has a pressure signal input that is equipped to receive a pressure signal, which reproduces the pressure in a tank; a comparator that is equipped to compare a capturing signal to at least one minimum value; and includes a status output that is connected to the comparator. The status output is equipped to emit a refueling signal when the received capturing signal is more than the minimum value. The refueling signal indicates that the refueling process is taking place. The capturing signal corresponds to the pressure signal and/or the first time derivative of the pressure signal. Also described is a controller, a corresponding control method and the use of a tank pressure sensor, which include each of the features of the device and the method.
摘要:
A procedure for determining the vapor pressure of a fuel in a tank is provided, whereby the sound velocity and/or a variable representing the sound velocity are determined the in the gas-filled compartment of the tank and the vapor pressure is assumed from the sound velocity and/or from the variable representing the sound velocity at a familiar total pressure.
摘要:
A method for checking the tightness of a tank system of a vehicle wherein one introduces, with the aid of a pressure source, an overpressure relative to the atmospheric pressure over a pregiven time interval alternately into the tank system and a reference leak of a defined size connected in parallel to the tank system and detects at least one operating characteristic variable of the pressure source when introducing the pressure into the tank system (tank measurement) as well as when introducing into the reference leak (reference measurement) and compares the tank measurement to the reference measurement and, when there is a deviation of the tank measurement from the reference measurement by a pregiven value, drawing a conclusion as to a leak, is characterized in that, when a conclusion as to a leak is drawn, introducing pressure into the tank system over a further time interval, lengthening the tank measurement, thereafter executing a renewed reference measurement and outputting a fault announcement “leak” only when, by the latest, after the elapse of the further time interval, the tank measurement deviates from the renewed reference measurement likewise by a pregivable value.
摘要:
An active charcoal filter (20) of a tank-venting system stores fuel vaporizing in a tank (10). In order to check the operability of the tank-venting system, a leakage diagnostic unit (60) having a pump (50) is provided wherein the pump (50) is connected downstream of a switchover valve (70). A reference leak (81) is arranged parallel to the switchover valve (70). The switchover valve (70) includes two switching positions I and II. In the position I, the pump (50) is pressure-conductively connected to the line (80) and then pumps ambient air into the line (80) through the reference leak (81). The pumped flow, which is present at the output (51) of the pump (50), is, in the position I of the switchover valve (70) pure ambient air and, in the position II of the switchover valve (70), is air cleaned by the active charcoal filter (20). The pumped flow can therefore be outputted to the ambient of the vehicle via a line (52) without problems for the environment. Alternatively, the pumped flow at the output (51) of the pump (50) can be supplied to the intake manifold (40) via a return line. The tightness check takes place by detecting the current, which is to be supplied to the pump motor, and by determining whether the pumped flow, which is to be pumped by the pump (50) into the tank-venting system, deviates from the pumped flow which is present when introducing the underpressure via the reference leak.
摘要:
A method for checking the tightness of a tank system, especially of a tank-venting system of a vehicle, wherein an overpressure or an underpressure relative to the atmospheric pressure is introduced into the tank system by means of a pressure source and the time-dependent trace of at least one operating characteristic variable of the pressure source is detected when introducing the overpressure/underpressure up to reaching a first time point or a first pressure level and is compared to a time-dependent trace of the operating characteristic value up to this time point or up to this pressure level (expected diagnostic trace), the time-dependent trace being expected in the case of a tight tank system, and, a conclusion as to non-tightness is drawn when the detected time-dependent trace deviates from the expected diagnostic trace by at least a pregiven value, characterized in that, when a deviation is determined, the overpressure/underpressure in the tank-venting system is further increased up to reaching a second time point or a second pressure level; the operating characteristic value of the pressure source continues to be detected and compared to an expected further time-dependent trace of the operating variable in the case of a tight system (further diagnostic trace) and, a fault announcement is only then outputted when the detected time-dependent trace during the introduction of the further overpressure/underpressure deviates from the further diagnostic trace.
摘要:
A method and an arrangement for controlling a drive unit of a vehicle are suggested. In this method, the control functions for the power of the drive unit and the monitoring of these control functions are carried out by a single microcomputer. A monitoring module, which is separate from the microcomputer, is provided for checking the monitoring functions. The monitoring module transmits test signals to the microcomputer at a given time. The microcomputer then computes the monitoring function on the basis of test data. The result of the computation is transmitted to the monitoring module which checks the operability of the monitoring function in the microcomputer by making a comparison to stored values.
摘要:
The invention is directed to a method and an arrangement for controlling a positioning element of an internal combustion engine. In the method and arrangement, a positioning element is used which exhibits a so-called torque-reversal point. If the positioning device is in the region of the torque-reversal point, then the drive signal for the positioning device is changed in the sense of a current change which is as abrupt as possible.
摘要:
The invention is directed to a method and an arrangement for controlling the drive unit of a motor vehicle. The maximum permissible torque or the maximum permissible power is determined and fault reactions are initiated when the limit value is exceeded by a computed actual torque value or an actual power value.
摘要:
The invention is directed to a method for controlling the operating sequences in a motor vehicle equipped with an internal combustion engine to which amounts of fuel and air are supplied for influencing the engine torque. Furthermore, the motor vehicle includes an automatic transmission having a ratio which can be changed. The overrun operation of the motor vehicle is detected in dependence upon the position of an accelerator pedal actuated by the driver and in dependence upon a comparison of the rpm of the engine and/or the input and/or the output rpm of the transmission to at least one threshold value. The fuel quantity is at least reduced compared to normal operation when an overrun is detected. The essence of the invention is that, when overrun operation of the vehicle is detected, a downshift operation of the transmission is triggered in dependence upon the further comparison of the rpm of the engine and/or the input and/or output rpms of the transmission to at least the above-mentioned threshold value or a further threshold value. In this way, the braking torque of the engine acting at the transmission output is significantly increased within a short time. Furthermore, the downshift operation can be configured to more comfortable by a short-term increase of the engine torque.
摘要:
The invention is directed to a method and an arrangement for controlling an internal combustion engine wherein a signal representing engine load is compared to a maximum value pregiven for at least one driver command range. Fault and emergency reactions are initiated when the measured signal value reaches or exceeds the maximum value.